Poster Presentation

[Remote] Impact of Black Hole Activity on Line Intensity Mapping Statistics

Author(s): Erika Ogata (University of Tokyo), Kana Moriwaki (University of Tokyo), Rui Lan Jun(University of Tokyo)

Presenter: Ogata Erika (University of Tokyo)

Line intensity mapping (LIM) probes the integrated emission from unresolved galaxies and is widely used to trace cosmic star formation. We quantify the impact of accreting black holes on LIM observables using cosmological hydrodynamic simulations and mock lightcones for the Hα and He II 1640 Å lines. We find that black hole–powered emission, although rare, dominates the brightest voxels. For Hα, its impact is limited to a small fraction of voxels and mainly affects small-scale power. In contrast, black hole emission dominates bright He II voxels over a wide redshift range, enhancing the power spectrum amplitude by factors of order unity. These results highlight the potential of multi-line LIM surveys to probe black hole growth.